The **Hour with Leading Zero** function (HOUR_WITH_LEADING_ZERO) generates a number that represents the hour with Leading Zero for a timestamp provided in a given timezone. ​

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{{:​hour_with_leading_zero_initial.png?​direct&​600|}}

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===== Parameters =====

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The **Hour with Leading Zero** function has two parameters, one of which is required:

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==== Timestamp ====

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Allowed Inputs: [[Field|field]] value or a number representing a Unix timestamp.

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There are several sources of Unix timestamps available. ​ For example the stored value of a [[Field Type - Date|date]] or [[Field Type - Date Time| date time]] field is a Unix timestamp. ​ Also When using the advanced interface the output of the [[Expression Function - Date|date]] or [[Expression Function - Date and Time| date time]] expression function is a Unix timestamp.

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==== Timezone ====

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Allowed Inputs: [[Field|field]] value or a text string

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The second optional parameter of the **Hour with Leading Zero** function is a string that represents the timezone. ​ Either use the query builder to choose a field that contains the value or use type a value to enter a number. ​ The value should be based on the tz (timezone) database used by Linux and other Unix system in the form “Area/​Location” e.g. "​America/​New_York"​. ​ If no value is provided then the current user's timezone is used.

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===== Output =====

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The output of the **Hour with Leading Zero** function is number representing the hour with Leading Zero for the value of the timestamp provided in a given timezone.

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===== Example =====

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For example HOUR_WITH_LEADING_ZERO(1349047828,"​America/​New_York"​) would result in "​07"​ and HOUR_WITH_LEADING_ZERO(1349047828,"​Asia/​Tokyo"​) would result in "​08"​.